I went to change my front diff fluid and as I was draining the oil I thought it was pretty easy. Then I thought, isn't there supposed to be a skid plate here?? I thought I remembered reading on the Z71 there was supposed to be skid plates under the truck. I have had the truck for a few months and never paid attention to it. There is a Z71 decal. So what does the Z71 mean? Are there supposed to be skid plates or not? How do i tell if this is a real Z71? Yikes!